Force

when an object moves in a straight line, which statement is true?

• when the object moves at a constant speed, the resultant force is zero

• when the object accelerates, the resultant force is zero

• when the object moves at a constant speed, the forward force is greater than the the resistive force

• the object requires a resultant force in order to move at a constant speed

Which of the following collections of properties contain only features which can be changed by a resultant force?

• Speed, direction, mass.

• Density, speed, shape.

• Shape, speed, direction.

• Speed, direction, temperature.

Two metal blocks P and Q have identical dimensions. They hang on identical spring balances. What can be deduced about P and Q?

• They have different volumes and different weights.

• They have different volumes, but equal masses.

• They have equal volumes and equal weights.

• They have equal volumes, but different masses.

Objects with different masses are hung on a spring. The diagram shows how much the spring stretches. The extension of the spring is directly proportional to the mass hung on it. What is the mass of object M?

• 110 kg

• 150 kg

• 200 kg

• 300 kg

An experiment is carried out to measure the extension of a rubber band for different loads. The results are shown on the table. Which figure is missing from the table?

• 17,2

• 17,3

• 17,4

• 17,6

Weight is an example of which quantity?

• acceleration

• mass

• force

• pressure

The mass of an object is measured on Earth. The mass is 5.0kg. The object is taken to the Moon. The mass of the object is measured on the Moon. What is the mass of the object on the Moon?

• 0 kg

• more than 0 kg, but less than 5 kg

• 5 kg

• more than 5 kg

Which statement about mass or weight is correct?

• Mass is a force.

• Mass is measured in newtons.

• Weight is a force.

• Weight is measured in kilograms.

A student stands with both feet on some scales in order to measure his weight. The reading on the scales is 500N. He lifts one foot off the scales and keeps it lifted. What is the new reading on the scales?

• 0 N

• 250 N

• 500 N

• 1000 N

A geologist places a small rock on the left-hand pan of a balance. The two pans are level as shown when masses with a total weight of 23 N are placed on the right-hand pan. Take the weight of 1.0 kg to be 10 N. What is the mass of the small rock?

• 0.023 kg

• 2.3 kg

• 23 kg

• 230 kg